The usual fare: log out, disable biometrics, use long pins and passwords, power off. Prefer a burner device, or clean your device and restore when you arrive.
I remember how Google's internal guidelines for travel circa 2011 required to remove any material under NDA from your laptop when traveling to China or Russia; you had to restore it over the VPN after a safe arrival. Funny that now the same precautions apply to the US :((
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Do you need to disable biometrics if you simply reboot? my Pixel 10 Pro XL wont let me in without pin after reboot. Biometrics wont work until that first unlock.
The guidelines also say that if the border agents of China or Russia ask you point blank, to give them access. It is not worth risking your personal safety for your device. That includes your PIN and password, and in China and Russia's case, whether or not that's actually allowed by law.